Educational



(No Model.)

* A. H. KENNEDY.

EDUCATIONAL APPLIANCE.

No. 296,018. Patented Apr. 1, 1884'.

N PETERS. Phmo-lilhumpher, Wahinflbn. I7. (I.

UNITED STATES PATENT" OFFICE.

ALBERT H. KENNEDY, OFROCKPORT, INDIANA.

EDUCATIONAL APPLIANCE.

SPECIFICATION forming part of Letters Patent No. 296,018, dated April 1,18 84. Application filed October 29, 1883. (No model.)

To all whom it may concern.-

Be it known that I, A. H. KENNEDY, of Rockport, in the county of Spencerand State of Indiana, have invented certain new and useful ImprovementsinEd ucational Appliances; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it pertains to make and use it,reference being had to the accompanying drawings, which form part ofthis specification.

My invention relates to an improvement in educational appliances; and itconsists in'the combination ofa cylinder, a cone, and a semisphericalcup, all of the same diameters, the cylinder and the cone being securedtogether, as will be more fully described hereinafter.

The object of my invention is to demonstrate by experiment severalgeometrical truths, and is to be used in teaching geometry.

Figure 1 represents a perspective of the cone and the cylinder. Fig. 2.is a separate view of the hemisphere.

A represents the cylinder, which will have a length just equal to itsdiameter. Inside of this cylinder is secured a cone, 0, which has thesame diameter as the cylinder, and which is of the same length. asthe'cylinder. In connection with these two bodies I use a semisphere, D,which has the same diameter as the cone and the cylinder.

Instead of the cone being secured in the cylinder, as here shown, thesemi-sphere may be secured to it in the same manner. All three of thesebodies will be made of tin, brass, or some other cheap material. Two ofthe parts are connected together for convenience of demonstration.

The three bodies demonstrate the following: First, the convex surface ofthe cylinder is equal to the surface of a sphere of the same diameter;second, the semi-sphere emptied in a cone of the. same diameter, andhaving a length equal to its diameter, will exactly fill it; third, asemi-sphere emptied twice into a cylinder of the same diameter, andhaving the same length at its diameter, and around a cone, which has thesame diameter and length as the cylinder, fills the space between thecylinder and the cone exactly. These experiments show that a cone isequivalent to one-third of the circumscribed cylinder of the samediameter and length, and that a globe is two-thirds of the circumscribedcylinder of the same diame ter, and having a length equal to itsdiameter. The cone and cylinder being secured together, the semi-sphereis used to fill them. Should the semisphere be secured to the cylinder,the cone will then be used to fill the other two.

Having thus described my invention, I claim An illustrative apparatusfor showing the volume of symmetrical solids, consisting of a hollowcylinder and cone of the same diameter and height, the cone beingsecured inside of the cylinder, and a hollow hemisphere of the samediameter as the other parts, all adapted to be used together,for thepurpose described.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT H. KENNEDY.-

Witnesses:

FRANCIS .I. REINHARD, W. T. MASON.

